#!/usr/bin/env python
# license removed for brevity
import rospy
from std_msgs.msg import String

def talker():
    pub = rospy.Publisher('chatter', String, queue_size=10)
    rospy.init_node('talker', anonymous=True)
    rate = rospy.Rate(10) # 10hz
    while not rospy.is_shutdown():
       hello_str = "hello world"
       rospy.loginfo(hello_str)
       pub.publish(hello_str)
       rate.sleep()

if __name__ == '__main__':
     try:
          talker()
     except rospy.ROSInterruptException:
          pass 